Things you can do to update Josm on Ubuntu and how to make Josm use more memory.
To find out how much memory you have in your Linux computer.
The /proc file system has information about your computer.
There are many memory values listed.
For the first memory measurement, make sure Josm is not running.
MemTotal: 3311836 kB
MemFree: 1470652 kB
MemAvailable: 2071568 kB
Buffers: 34308 kB
Now start Josm and run the memory information page again.
MemTotal: 3311836 kB
MemFree: 129060 kB
MemAvailable: 192160 kB
Buffers: 15272 kB
Next, here is how I start Josm with a larger amount of memory.
Again from a terminal. You can see I am doing this as a regular user from my openstreet sub directory
:~/openstreet$ java -Xmx2048m -jar /usr/share/josm/josm.jar
Finally, here is how I upgrade from Ubuntu’s fairly old version of josm.jar
Be very careful with “sudo”. Try each command without sudo so you can be sure you typed correctly
Again from a terminal. Check your Java version.
openjdk version “11.0.11” 2021-04-20
OpenJDK Runtime Environment (build 11.0.11+9-Ubuntu-0ubuntu2.20.04)
OpenJDK 64-Bit Server VM (build 11.0.11+9-Ubuntu-0ubuntu2.20.04, mixed mode, sharing)
Next From the Josm program page saying “download” , download the latest Josm file.
My downloads all go to Downloads.
Copy the downloaded “josm-tested.jar” file to the following directory
Look at the directory with ls -l. See two things to deal with
The yellow color entry is a soft link.
Our new josm-tested.jar file has the wrong owner.
drwxr-xr-x 2 root root 12288 Jan 19 22:53 data
-rw-r–r-- 1 root root 15286732 Dec 29 2020 josm-1.5.svn17428.jar
lrwxrwxrwx 1 root root 15 Jul 8 23:24 josm.jar → josm-1.5.svn17428.jar
-rw-r–r-- 1 user user 15813993 Jul 8 23:11 josm-tested.jar
Test out your downloaded file before we modify owner names.
java -jar josm-tested.jar
Change owner of the new file. Try the command without sudo first.
sudo chown root:root josm-tested.jar
Delete the existing soft link to the name josm.jar
sudo rm josm.jar
Recreate the soft link josm.jar now points to the new Josm-tested.jar
sudo ln -s josm-tested.jar josm.jar